JP2013017929A - 二酸化炭素の還元方法及び還元装置 - Google Patents
二酸化炭素の還元方法及び還元装置 Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 377
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 188
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 188
- 238000000034 method Methods 0.000 title claims abstract description 68
- 230000009467 reduction Effects 0.000 title claims abstract description 47
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- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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Abstract
【解決手段】二酸化炭素を吸収した水性液に、光触媒の存在下で可視光を照射して水性液中の二酸化炭素を光還元する光反応工程によって、メタン等の還元生成物が得られる。吸収塔において排ガス等を水性液に接触させて二酸化炭素を水性液に吸収させ、水性液に吸収された二酸化炭素は、光反応塔で行う光反応において光還元される。
【選択図】図1
Description
二酸化チタンを用い、常法に従って(参照:「J.Photochem. Photobiol. A:Chem, 72(1993), pp269-271」、又は、大谷文章著「光触媒標準研究法」)、パラジウム、ロジウム、白金、金、銅及びルテニウムのうちの一種を担持させた担持触媒を各々調製した。
上述に従って用意した各触媒0.15gを蒸留水1.5mlに混合し、常圧の二酸化炭素(100%)雰囲気1.5mlと接触させた状態で400nm以上の可視光を5時間照射した後、二酸化炭素雰囲気に含まれる他の成分(メタン、エタン、メタノール、ギ酸、酢酸)を二酸化炭素の還元生成物として定量し、二酸化炭素の反応速度(単位:μmol/g−触媒/時間)を求めた。結果を表1に示す。
触媒の反応速度
触媒 TiO2 Pd/TiO2 Rh/TiO2 Pt/TiO2
反応速度 0.06 0.41 0.31 0.12
触媒 Au/TiO2 Cu/TiO2 Ru/TiO2 レニウム錯体
反応速度 0.15 0.16 0.08 13.3
上述のレニウム錯体1gを蒸留水300gに加えて、常温で、常圧の二酸化炭素(100%)雰囲気240mlと接触させた状態で300Wのキセノンランプ(350nm以上)の可視光を照射し、二酸化炭素雰囲気に含まれる他の成分(水素、酸素、窒素、メタン、一酸化炭素)を二酸化炭素の還元生成物として定量し、二酸化炭素雰囲気中の濃度と照射時間との関係を調べた。結果を図2のグラフに示す。
50:気液分離器、 60:冷却装置、 11,31,41:充填材、
12,23,32,42:ポンプ、 16,17,61,62:流路、
21:光源、 25:冷却器、 26:凝縮部、
33,43:水冷式冷却器、 52:容器
G,G’:ガス、 R:回収ガス、 A1,A2:吸収液。
Claims (16)
- 二酸化炭素を吸収した水性液に、光触媒の存在下で可視光を照射して前記水性液中の二酸化炭素を光還元する光反応工程を有することを特徴とする二酸化炭素の還元方法。
- 前記水性液は、二酸化炭素に親和性を有する吸収剤を含有する請求項1に記載の二酸化炭素の還元方法。
- 前記光触媒は、複核金属錯体触媒、レニウムビピリジン錯体触媒、ルテニウムビピリジン錯体触媒、半導体光触媒組成物、硫化物触媒、酸化物触媒、酸化物担持触媒及び塩化物触媒からなる群より選択される少なくとも1種の可視光応答性を有する触媒を含む請求項1又は2に記載の二酸化炭素の還元方法。
- 前記吸収剤は、アルカノールアミン化合物を含み、前記光触媒は、レニウム−ルテニウム超分子錯体、fac-Re(bpy)(CO)3Cl、cis-[Re(bpy)2(CO)2]PF6、Ru(bpy)2Cl2、Cu/ZnOとTiMO2(但し、MはPt等の金属)との混合組成物、Cd/ZnS、Pb/ZnS、Ni/ZnS、Ag/ZnS、Cu/ZnS、SrTiO3、Cu/WO3、Pd/WO3、Pt/WO3及びCoCl2からなる群より選択される少なくとも1種の触媒を含む請求項1又2に記載の二酸化炭素の還元方法。
- 更に、二酸化炭素を含有するガスを水性液に接触させて前記水性液に二酸化炭素を吸収させる吸収工程を有し、前記吸収工程によって吸収された二酸化炭素を前記光反応工程において光還元する請求項1〜4の何れかに記載の二酸化炭素の還元方法。
- 前記吸収工程と前記光反応工程とは、個別の工程であり、交互に繰り返される請求項5に記載の二酸化炭素の還元方法。
- 前記光触媒は前記水性液に溶解し、前記水性液と共に、前記吸収工程及び前記光反応工程間を循環する請求項6に記載の二酸化炭素の還元方法。
- 前記光触媒は前記水性液に分散し、前記吸収工程を繰り返す前に、更に、光触媒を水性液から分離させる工程を有する請求項6に記載の二酸化炭素の還元方法。
- 二酸化炭素を吸収した水性液に、光触媒の存在下で可視光を照射して前記水性液中の二酸化炭素を光還元する光反応塔を有することを特徴とする二酸化炭素の還元装置。
- 前記水性液は、二酸化炭素に親和性を有する吸収剤を含有する請求項9に記載の二酸化炭素の還元装置。
- 前記光触媒は、複核金属錯体触媒、レニウムビピリジン錯体触媒、ルテニウムビピリジン錯体触媒、半導体光触媒組成物、硫化物触媒、酸化物触媒、酸化物担持触媒及び塩化物触媒からなる群より選択される少なくとも1種の触媒を含む請求項9又は10に記載の二酸化炭素の還元装置。
- 前記吸収剤は、アルカノールアミンを含み、前記光触媒は、レニウム−ルテニウム超分子錯体、fac-Re(bpy)(CO)3Cl、cis-[Re(bpy)2(CO)2]PF6、Ru(bpy)2Cl2、Cu/ZnOとTiMO2(但し、MはPt等の金属)との混合組成物、Cd/ZnS、Pb/ZnS、Ni/ZnS、Ag/ZnS、Cu/ZnS、SrTiO3、Cu/WO3、Pd/WO3、Pt/WO3及びCoCl2からなる群より選択される少なくとも1種の触媒を含む請求項9又10に記載の二酸化炭素の還元装置。
- 更に、二酸化炭素を含有するガスを前記水性液に接触させて前記水性液に二酸化炭素を吸収させる吸収塔を有し、前記吸収塔において吸収された二酸化炭素を前記光反応塔において光還元する請求項9〜12の何れかに記載の二酸化炭素の還元装置。
- 前記水性液は、前記吸収塔と前記光反応塔とを循環し、二酸化炭素の吸収及び還元が交互に繰り返される請求項13に記載の二酸化炭素の還元装置。
- 前記光触媒は前記水性液に溶解し、前記水性液と共に、前記吸収塔及び前記光反応塔間を循環する請求項14に記載の二酸化炭素の還元装置。
- 前記光触媒は前記水性液に分散し、前記吸収塔へ循環する前の水性液から前記光触媒を分離させる手段を有する請求項14に記載の二酸化炭素の還元装置。
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